Calf exercise device



FIG. 1 is a front perspective view closed of a calf exercise device accordance with the new design;

FIG. 2 is a left-side view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof.

The broken lines shown in the figures are for the purpose of illustrating portions of the calf exercise device which form no part of the claimed design. 

CLAIM The ornamental design for calf exercise device, as shown and described. 